WCu70 / 70W30Cu Tungsten Copper Block

Zhuzhou Jiuding Metal Technology Corp Ltd is a professional manufacturer and supplier of high-performance tungsten-copper alloy products based in Zhuzhou, Hunan, China — the capital of the tungsten industry. We focus on the R&D, production and customized machining of tungsten-copper blocks, tungsten-copper plates and electrical contact components. All our WCu70 tungsten-copper blocks are strictly produced and inspected in compliance with GB/T 8320 Chinese National Standard and ASTM B702 International Standard, ensuring that chemical composition, physical properties and dimensional accuracy are fully consistent with global industrial standards. With advanced vacuum infiltration powder metallurgy technology and a complete quality testing system, we supply stable, high-purity and low-loss tungsten-copper conductive blocks to global EDM, welding and power electrical industries.

Product Overview

WCu70 / CuW70 (70% tungsten, 30% copper) is a high-performance customized tungsten-copper block professionally manufactured by Zhuzhou Jiuding Metal Technology using advanced vacuum infiltration powder metallurgy technology. Built on the baseline requirements of GB/T 8320-2017 and ASTM B702 dual standards, we provide optimized non-standard 70W30Cu customized blocks for special industrial scenarios. This customized grade features flexible composition tolerance and upgraded overall performance: W 70±3%, Cu 30±3%, density 13.7–14.5 g/cm³, hardness 83–100 HRB, and electrical conductivity 45–55% IACS. It perfectly combines tungsten's high-temperature resistance, arc-erosion resistance and structural rigidity with copper's excellent electrical and thermal conductivity, delivering superior mechanical toughness and stable electrical performance. With low discharge loss, uniform pore-free internal structure and outstanding high-temperature dimensional stability, it is an ideal customized material for precision EDM machining, industrial resistance welding, high-voltage switch arc-extinguishing and high-end electronic heat-dissipation components.

Dual Standard Compliance (GB/T 8320 & ASTM B702)

Our 70W30Cu tungsten-copper products are certified to both the Chinese national standard and the American industry standard, with standardized composition tolerances and performance indicators to meet global procurement and industrial testing requirements:

GB/T 8320(Chinese National Standard): The official national standard for copper-tungsten and silver-tungsten electrical contact alloys. It defines our product's formal grade as CuW(70), specifying strict chemical composition tolerances, density, hardness, electrical conductivity, resistivity and mechanical strength indicators for tungsten-copper electrode materials. It is the authoritative manufacturing and inspection basis for industrial tungsten-copper blocks and electrical contact components in China.

ASTM B702 (US Industry Standard): The internationally recognized standard for tungsten-copper alloy raw materials and finished products. It regulates unified dimensional tolerances, physical performance indicators and quality inspection criteria for W70Cu30 alloys, fully meeting overseas high-end equipment matching, international procurement and export certification requirements.

GB/T 8320 CuW(70) Standard Grade Specification

According to the official provisions of GB/T 8320-2017, CuW(70) is the standard formal grade for our 70W30Cu tungsten-copper block. The standard clearly stipulates the core performance parameters and impurity control requirements, all of which are fully implemented in Jiuding Metal's production and quality inspection:

Standard Grade: CuW(70) (National Standard Base Grade)

Standard Composition Tolerance: Tungsten 70%±2%, Copper 30%±2%, total impurities ≤0.5%

Standard Hardness: ≥ HB 175

Standard Bending Strength: ≥ 790 MPa

Standard Resistivity: ≤ 4.1 μΩ·cm

Standard Electrical Conductivity: ≥ 42% IACS

Standard Density: ≥ 13.8 g/cm³

Jiuding Customized 70W30Cu Grade Parameters

To meet diverse special industrial processing demands, we have developed optimized non-standard CuW70 tungsten-copper blocks based on national and American standards, with independently customized and controllable core performance parameters for high-precision industrial applications:

Custom Alloy Composition: Tungsten 70±3%, Copper 30±3%, total impurities ≤0.5%

Custom Density Range: 13.7–14.5 g/cm³

Custom Hardness (HRB): 83–100 HRB (stable and uniform)

Custom Conductivity: 45–55% IACS (higher than the standard grade)

Custom Resistivity: 3.3–4.0 μΩ·cm

Product Specification & Model Parameters

The following is the standardized model specification of the JDTG-WCu-004 CuW70 tungsten-copper block launched by ZZJD (Zhuzhou Jiuding Metal). All indicators are strictly implemented in accordance with the GB/T 8320 and ASTM B702 dual standards, supported by complete factory qualifications and third-party certification:

Core Technical Specifications (Standard Compliant)

All technical parameters fully conform to GB/T 8320-2017 and ASTM B702 standards, with strict impurity control and stable comprehensive performance:

Key Product Features

Dual Standard Basis & Custom Optimized Performance: Our products are manufactured strictly based on GB/T 8320-2017 and ASTM B702 dual standards, with independent customized optimization for special industrial needs. Adopting flexible component tolerance of W70±3% and Cu30±3%, the customized tungsten copper block features a controllable density range of 13.7–14.5 g/cm³, stable hardness of 83–100 HRB and upgraded high conductivity of 45–55% IACS. Compared with standard CuW70 products, our customized blocks deliver better electrical conductivity, balanced hardness and toughness, with uniform pore-free internal structure and stronger adaptive comprehensive performance for diverse industrial scenarios.

Ultra-Low Erosion & Extended Service Life: The high-tungsten formula provides excellent arc-ablation resistance and anti-sticking performance. It effectively resists arc impact and high-temperature oxidation during EDM and welding processes, reducing conductive loss by 30% compared with ordinary pure copper blocks, greatly extending service life.

Balanced Electrical & Thermal Conductivity: The optimized 70/30 tungsten-copper ratio ensures stable discharge performance and rapid heat dissipation. It avoids thermal deformation and burnout under high-current continuous operation, maintaining high-precision machining stability.

High Structural Strength & Dimensional Stability: Produced by the vacuum infiltration sintering process, the product features high compactness and mechanical strength. It remains non-deformable and crack-free in high-temperature and high-pressure working environments, meeting high-precision repeated processing requirements.

Excellent Machinability & Customization: It integrates tungsten rigidity with copper ductility, supporting precision turning, grinding, cutting and drilling. We provide full-size non-standard customization to match various equipment and application scenarios.

Main Applications

With dual-standard qualified performance, our WCu70 tungsten-copper blocks are widely used in high-precision and high-reliability industrial fields worldwide:

Precision EDM Machining: Ideal electrode for mold steel, alloy steel and hard metal EDM processing, featuring low loss and high surface finish.

Industrial Resistance Welding: Applied to spot welding and projection welding electrodes for auto parts, hardware and alloy components, with stable discharge and anti-adhesion effects.

High-voltage Power Equipment: Used for arc-extinguishing contacts and conductive parts of 10kV vacuum circuit breakers, high-voltage switches and power distribution equipment.

Aerospace & Electronic Heat Dissipation: High-efficiency thermal conductive structural parts for precision electronic devices and aerospace industrial equipment.

Precision Conductive Components: Custom high-temperature-resistant conductive parts for automated precision mechanical systems.

Manufacturing & Quality Assurance (Jiuding Metal)

As a certified factory with ISO9001, ISO45001, ISO18001 and ISO13485 qualifications, Zhuzhou Jiuding Metal strictly adopts the advanced vacuum infiltration powder metallurgy process for all JDTG-WCu-003 series CuW70 products. We implement full-process quality control in compliance with the GB/T 8320-2017 and ASTM B702 dual standards, covering raw material selection, pressing, high-temperature sintering, finish machining and final precision inspection. We can provide authoritative supporting documents, including third-party material test reports, COA certificates and EN10204 3.1 inspection reports, according to customer requirements, ensuring full traceability and global export compliance of product quality.

Packaging & Global Shipping

To prevent oxidation, collision and deformation during transportation, all tungsten-copper blocks are treated with anti-rust oil, wrapped with shockproof bubble film and packed in standard export cartons or wooden cases. We support global sea freight, air freight and international express delivery, providing flexible customized packaging and delivery solutions for standard and bulk orders to ensure safe and timely delivery worldwide.